Move offset, size and stride to separate chunk structure that we
can keep in shared memory.
Add shared metadata type to hold the memory block holding the
metadata.
Move array and map to pinos
Move more things to spa lib
ControlCmd -> Message
Make pinos log, use for plugins as well
work on ringbuffer in alsa and nodes
work on making registry with all objects
spa_serialize -> pinos_serialize
Improve PinosPort, move links to the object and make it part of
PinosNode
Work on improving signals to react to changes in the graph
Error when a client-node becomes unlinked, like when removing a camera.
Move the proxy plugin to the client-node
Move serialization code to pinos because its specific to pinos
Move some functions to the .h files
Make the mapper dynamic
